How to take circular ROI
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Hi, I am trying to get a circular ROI within the image. For rectangular ROI we can use imrect and get the position/coordinate, so is there a similar function to take circular ROI ?. I tried with imellipse but the coordinate that the function return I am not able to crop using imcrop. I am attaching an image here with desire ROI please let me know your suggestions. Thank you,
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/157964/image.jpeg)
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Answers (2)
Image Analyst
on 11 Nov 2016
Edited: Image Analyst
on 11 Nov 2016
Simply threshold
Mask = grayImage > someThresholdValue;
Tim Jackman
on 21 Sep 2018
Starting in 18b, you can use drawcircle to create a circular ROI:
https://www.mathworks.com/help/images/ref/drawcircle.html
For more information about the new suite of ROI tools, please take a look at the following link:
https://www.mathworks.com/help/images/roi-based-processing.html
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